1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kmod.h>
3 #include <linux/netdevice.h>
4 #include <linux/inetdevice.h>
5 #include <linux/etherdevice.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/net_tstamp.h>
8 #include <linux/phylib_stubs.h>
9 #include <linux/ptp_clock_kernel.h>
10 #include <linux/wireless.h>
11 #include <linux/if_bridge.h>
12 #include <net/dsa_stubs.h>
13 #include <net/netdev_lock.h>
14 #include <net/wext.h>
15
16 #include "dev.h"
17
18 /*
19 * Map an interface index to its name (SIOCGIFNAME)
20 */
21
22 /*
23 * We need this ioctl for efficient implementation of the
24 * if_indextoname() function required by the IPv6 API. Without
25 * it, we would have to search all the interfaces to find a
26 * match. --pb
27 */
28
dev_ifname(struct net * net,struct ifreq * ifr)29 static int dev_ifname(struct net *net, struct ifreq *ifr)
30 {
31 ifr->ifr_name[IFNAMSIZ-1] = 0;
32 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
33 }
34
35 /*
36 * Perform a SIOCGIFCONF call. This structure will change
37 * size eventually, and there is nothing I can do about it.
38 * Thus we will need a 'compatibility mode'.
39 */
dev_ifconf(struct net * net,struct ifconf __user * uifc)40 int dev_ifconf(struct net *net, struct ifconf __user *uifc)
41 {
42 struct net_device *dev;
43 void __user *pos;
44 size_t size;
45 int len, total = 0, done;
46
47 /* both the ifconf and the ifreq structures are slightly different */
48 if (in_compat_syscall()) {
49 struct compat_ifconf ifc32;
50
51 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
52 return -EFAULT;
53
54 pos = compat_ptr(ifc32.ifcbuf);
55 len = ifc32.ifc_len;
56 size = sizeof(struct compat_ifreq);
57 } else {
58 struct ifconf ifc;
59
60 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
61 return -EFAULT;
62
63 pos = ifc.ifc_buf;
64 len = ifc.ifc_len;
65 size = sizeof(struct ifreq);
66 }
67
68 /* Loop over the interfaces, and write an info block for each. */
69 rtnl_net_lock(net);
70 for_each_netdev(net, dev) {
71 if (!pos)
72 done = inet_gifconf(dev, NULL, 0, size);
73 else
74 done = inet_gifconf(dev, pos + total,
75 len - total, size);
76 if (done < 0) {
77 rtnl_net_unlock(net);
78 return -EFAULT;
79 }
80 total += done;
81 }
82 rtnl_net_unlock(net);
83
84 return put_user(total, &uifc->ifc_len);
85 }
86
dev_getifmap(struct net_device * dev,struct ifreq * ifr)87 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
88 {
89 struct ifmap *ifmap = &ifr->ifr_map;
90
91 if (in_compat_syscall()) {
92 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
93
94 cifmap->mem_start = dev->mem_start;
95 cifmap->mem_end = dev->mem_end;
96 cifmap->base_addr = dev->base_addr;
97 cifmap->irq = dev->irq;
98 cifmap->dma = dev->dma;
99 cifmap->port = dev->if_port;
100
101 return 0;
102 }
103
104 ifmap->mem_start = dev->mem_start;
105 ifmap->mem_end = dev->mem_end;
106 ifmap->base_addr = dev->base_addr;
107 ifmap->irq = dev->irq;
108 ifmap->dma = dev->dma;
109 ifmap->port = dev->if_port;
110
111 return 0;
112 }
113
netif_setifmap(struct net_device * dev,struct ifreq * ifr)114 static int netif_setifmap(struct net_device *dev, struct ifreq *ifr)
115 {
116 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
117
118 if (!dev->netdev_ops->ndo_set_config)
119 return -EOPNOTSUPP;
120
121 if (in_compat_syscall()) {
122 struct ifmap ifmap = {
123 .mem_start = cifmap->mem_start,
124 .mem_end = cifmap->mem_end,
125 .base_addr = cifmap->base_addr,
126 .irq = cifmap->irq,
127 .dma = cifmap->dma,
128 .port = cifmap->port,
129 };
130
131 return dev->netdev_ops->ndo_set_config(dev, &ifmap);
132 }
133
134 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
135 }
136
137 /*
138 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
139 */
dev_ifsioc_locked(struct net * net,struct ifreq * ifr,unsigned int cmd)140 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
141 {
142 int err;
143 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
144
145 if (!dev)
146 return -ENODEV;
147
148 switch (cmd) {
149 case SIOCGIFFLAGS: /* Get interface flags */
150 ifr->ifr_flags = (short)netif_get_flags(dev);
151 return 0;
152
153 case SIOCGIFMETRIC: /* Get the metric on the interface
154 (currently unused) */
155 ifr->ifr_metric = 0;
156 return 0;
157
158 case SIOCGIFMTU: /* Get the MTU of a device */
159 ifr->ifr_mtu = dev->mtu;
160 return 0;
161
162 case SIOCGIFSLAVE:
163 err = -EINVAL;
164 break;
165
166 case SIOCGIFMAP:
167 return dev_getifmap(dev, ifr);
168
169 case SIOCGIFINDEX:
170 ifr->ifr_ifindex = dev->ifindex;
171 return 0;
172
173 case SIOCGIFTXQLEN:
174 ifr->ifr_qlen = dev->tx_queue_len;
175 return 0;
176
177 default:
178 /* dev_ioctl() should ensure this case
179 * is never reached
180 */
181 WARN_ON(1);
182 err = -ENOTTY;
183 break;
184
185 }
186 return err;
187 }
188
net_hwtstamp_validate(const struct kernel_hwtstamp_config * cfg)189 int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
190 {
191 enum hwtstamp_tx_types tx_type;
192 enum hwtstamp_rx_filters rx_filter;
193 int tx_type_valid = 0;
194 int rx_filter_valid = 0;
195
196 if (cfg->flags & ~HWTSTAMP_FLAG_MASK)
197 return -EINVAL;
198
199 tx_type = cfg->tx_type;
200 rx_filter = cfg->rx_filter;
201
202 switch (tx_type) {
203 case HWTSTAMP_TX_OFF:
204 case HWTSTAMP_TX_ON:
205 case HWTSTAMP_TX_ONESTEP_SYNC:
206 case HWTSTAMP_TX_ONESTEP_P2P:
207 tx_type_valid = 1;
208 break;
209 case __HWTSTAMP_TX_CNT:
210 /* not a real value */
211 break;
212 }
213
214 switch (rx_filter) {
215 case HWTSTAMP_FILTER_NONE:
216 case HWTSTAMP_FILTER_ALL:
217 case HWTSTAMP_FILTER_SOME:
218 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
219 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
220 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
221 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
222 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
223 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
224 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
225 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
226 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
227 case HWTSTAMP_FILTER_PTP_V2_EVENT:
228 case HWTSTAMP_FILTER_PTP_V2_SYNC:
229 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
230 case HWTSTAMP_FILTER_NTP_ALL:
231 rx_filter_valid = 1;
232 break;
233 case __HWTSTAMP_FILTER_CNT:
234 /* not a real value */
235 break;
236 }
237
238 if (!tx_type_valid || !rx_filter_valid)
239 return -ERANGE;
240
241 return 0;
242 }
243
244 /**
245 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
246 * or of attached phylib PHY
247 * @dev: Network device
248 * @cfg: Timestamping configuration structure
249 *
250 * Helper for calling the default hardware provider timestamping.
251 *
252 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
253 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
254 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
255 * the netdev handle the GET request.
256 */
dev_get_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg)257 int dev_get_hwtstamp_phylib(struct net_device *dev,
258 struct kernel_hwtstamp_config *cfg)
259 {
260 struct hwtstamp_provider *hwprov;
261
262 hwprov = rtnl_dereference(dev->hwprov);
263 if (hwprov) {
264 cfg->qualifier = hwprov->desc.qualifier;
265 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
266 hwprov->phydev)
267 return phy_hwtstamp_get(hwprov->phydev, cfg);
268
269 if (hwprov->source == HWTSTAMP_SOURCE_NETDEV)
270 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
271
272 return -EOPNOTSUPP;
273 }
274
275 if (phy_is_default_hwtstamp(dev->phydev))
276 return phy_hwtstamp_get(dev->phydev, cfg);
277
278 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
279 }
280
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)281 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
282 {
283 const struct net_device_ops *ops = dev->netdev_ops;
284 struct kernel_hwtstamp_config kernel_cfg = {};
285 struct hwtstamp_config cfg;
286 int err;
287
288 if (!ops->ndo_hwtstamp_get)
289 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */
290
291 if (!netif_device_present(dev))
292 return -ENODEV;
293
294 kernel_cfg.ifr = ifr;
295 netdev_lock_ops(dev);
296 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
297 netdev_unlock_ops(dev);
298 if (err)
299 return err;
300
301 /* If the request was resolved through an unconverted driver, omit
302 * the copy_to_user(), since the implementation has already done that
303 */
304 if (!kernel_cfg.copied_to_user) {
305 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
306
307 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
308 return -EFAULT;
309 }
310
311 return 0;
312 }
313
314 /**
315 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
316 * or of attached phylib PHY
317 * @dev: Network device
318 * @cfg: Timestamping configuration structure
319 * @extack: Netlink extended ack message structure, for error reporting
320 *
321 * Helper for enforcing a common policy that phylib timestamping, if available,
322 * should take precedence in front of hardware timestamping provided by the
323 * netdev. If the netdev driver needs to perform specific actions even for PHY
324 * timestamping to work properly (a switch port must trap the timestamped
325 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
326 */
dev_set_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)327 int dev_set_hwtstamp_phylib(struct net_device *dev,
328 struct kernel_hwtstamp_config *cfg,
329 struct netlink_ext_ack *extack)
330 {
331 const struct net_device_ops *ops = dev->netdev_ops;
332 struct kernel_hwtstamp_config old_cfg = {};
333 struct hwtstamp_provider *hwprov;
334 struct phy_device *phydev;
335 bool changed = false;
336 bool phy_ts;
337 int err;
338
339 hwprov = rtnl_dereference(dev->hwprov);
340 if (hwprov) {
341 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
342 hwprov->phydev) {
343 phy_ts = true;
344 phydev = hwprov->phydev;
345 } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) {
346 phy_ts = false;
347 } else {
348 return -EOPNOTSUPP;
349 }
350
351 cfg->qualifier = hwprov->desc.qualifier;
352 } else {
353 phy_ts = phy_is_default_hwtstamp(dev->phydev);
354 if (phy_ts)
355 phydev = dev->phydev;
356 }
357
358 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
359
360 if (phy_ts && dev->see_all_hwtstamp_requests) {
361 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
362 if (err)
363 return err;
364 }
365
366 if (!phy_ts || dev->see_all_hwtstamp_requests) {
367 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
368 if (err) {
369 if (extack->_msg)
370 netdev_err(dev, "%s\n", extack->_msg);
371 return err;
372 }
373 }
374
375 if (phy_ts && dev->see_all_hwtstamp_requests)
376 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
377
378 if (phy_ts) {
379 err = phy_hwtstamp_set(phydev, cfg, extack);
380 if (err) {
381 if (changed)
382 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
383 return err;
384 }
385 }
386
387 return 0;
388 }
389
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)390 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
391 {
392 const struct net_device_ops *ops = dev->netdev_ops;
393 struct kernel_hwtstamp_config kernel_cfg = {};
394 struct netlink_ext_ack extack = {};
395 struct hwtstamp_config cfg;
396 int err;
397
398 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
399 return -EFAULT;
400
401 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
402 kernel_cfg.ifr = ifr;
403
404 err = net_hwtstamp_validate(&kernel_cfg);
405 if (err)
406 return err;
407
408 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
409 if (err) {
410 if (extack._msg)
411 netdev_err(dev, "%s\n", extack._msg);
412 return err;
413 }
414
415 if (!ops->ndo_hwtstamp_set)
416 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */
417
418 if (!netif_device_present(dev))
419 return -ENODEV;
420
421 netdev_lock_ops(dev);
422 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
423 netdev_unlock_ops(dev);
424 if (err)
425 return err;
426
427 /* The driver may have modified the configuration, so copy the
428 * updated version of it back to user space
429 */
430 if (!kernel_cfg.copied_to_user) {
431 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
432
433 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
434 return -EFAULT;
435 }
436
437 return 0;
438 }
439
generic_hwtstamp_ioctl_lower(struct net_device * dev,int cmd,struct kernel_hwtstamp_config * kernel_cfg)440 static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
441 struct kernel_hwtstamp_config *kernel_cfg)
442 {
443 struct ifreq ifrr;
444 int err;
445
446 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
447 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
448
449 err = dev_eth_ioctl(dev, &ifrr, cmd);
450 if (err)
451 return err;
452
453 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru;
454 kernel_cfg->copied_to_user = true;
455
456 return 0;
457 }
458
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)459 int generic_hwtstamp_get_lower(struct net_device *dev,
460 struct kernel_hwtstamp_config *kernel_cfg)
461 {
462 const struct net_device_ops *ops = dev->netdev_ops;
463
464 if (!netif_device_present(dev))
465 return -ENODEV;
466
467 if (ops->ndo_hwtstamp_get)
468 return dev_get_hwtstamp_phylib(dev, kernel_cfg);
469
470 /* Legacy path: unconverted lower driver */
471 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg);
472 }
473 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
474
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)475 int generic_hwtstamp_set_lower(struct net_device *dev,
476 struct kernel_hwtstamp_config *kernel_cfg,
477 struct netlink_ext_ack *extack)
478 {
479 const struct net_device_ops *ops = dev->netdev_ops;
480
481 if (!netif_device_present(dev))
482 return -ENODEV;
483
484 if (ops->ndo_hwtstamp_set)
485 return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
486
487 /* Legacy path: unconverted lower driver */
488 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg);
489 }
490 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
491
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)492 static int dev_siocbond(struct net_device *dev,
493 struct ifreq *ifr, unsigned int cmd)
494 {
495 const struct net_device_ops *ops = dev->netdev_ops;
496
497 if (ops->ndo_siocbond) {
498 int ret = -ENODEV;
499
500 netdev_lock_ops(dev);
501 if (netif_device_present(dev))
502 ret = ops->ndo_siocbond(dev, ifr, cmd);
503 netdev_unlock_ops(dev);
504
505 return ret;
506 }
507
508 return -EOPNOTSUPP;
509 }
510
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)511 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
512 void __user *data, unsigned int cmd)
513 {
514 const struct net_device_ops *ops = dev->netdev_ops;
515
516 if (ops->ndo_siocdevprivate) {
517 int ret = -ENODEV;
518
519 netdev_lock_ops(dev);
520 if (netif_device_present(dev))
521 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
522 netdev_unlock_ops(dev);
523
524 return ret;
525 }
526
527 return -EOPNOTSUPP;
528 }
529
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)530 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
531 {
532 const struct net_device_ops *ops = dev->netdev_ops;
533
534 if (ops->ndo_siocwandev) {
535 int ret = -ENODEV;
536
537 netdev_lock_ops(dev);
538 if (netif_device_present(dev))
539 ret = ops->ndo_siocwandev(dev, ifs);
540 netdev_unlock_ops(dev);
541
542 return ret;
543 }
544
545 return -EOPNOTSUPP;
546 }
547
548 /*
549 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock()
550 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)551 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
552 unsigned int cmd)
553 {
554 int err;
555 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
556 const struct net_device_ops *ops;
557
558 if (!dev)
559 return -ENODEV;
560
561 ops = dev->netdev_ops;
562
563 switch (cmd) {
564 case SIOCSIFFLAGS: /* Set interface flags */
565 return dev_change_flags(dev, ifr->ifr_flags, NULL);
566
567 case SIOCSIFMETRIC: /* Set the metric on the interface
568 (currently unused) */
569 return -EOPNOTSUPP;
570
571 case SIOCSIFMTU: /* Set the MTU of a device */
572 return dev_set_mtu(dev, ifr->ifr_mtu);
573
574 case SIOCSIFHWADDR:
575 if (dev->addr_len > sizeof(ifr->ifr_hwaddr))
576 return -EINVAL;
577 return dev_set_mac_address_user(dev,
578 (struct sockaddr_storage *)&ifr->ifr_hwaddr,
579 NULL);
580
581 case SIOCSIFHWBROADCAST:
582 if (ifr->ifr_hwaddr.sa_family != dev->type)
583 return -EINVAL;
584 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
585 min(sizeof(ifr->ifr_hwaddr.sa_data_min),
586 (size_t)dev->addr_len));
587 netdev_lock_ops(dev);
588 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
589 netdev_unlock_ops(dev);
590 return 0;
591
592 case SIOCSIFMAP:
593 netdev_lock_ops(dev);
594 err = netif_setifmap(dev, ifr);
595 netdev_unlock_ops(dev);
596 return err;
597
598 case SIOCADDMULTI:
599 if (!ops->ndo_set_rx_mode ||
600 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
601 return -EINVAL;
602 if (!netif_device_present(dev))
603 return -ENODEV;
604 netdev_lock_ops(dev);
605 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
606 netdev_unlock_ops(dev);
607 return err;
608
609 case SIOCDELMULTI:
610 if (!ops->ndo_set_rx_mode ||
611 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
612 return -EINVAL;
613 if (!netif_device_present(dev))
614 return -ENODEV;
615 netdev_lock_ops(dev);
616 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
617 netdev_unlock_ops(dev);
618 return err;
619
620 case SIOCSIFTXQLEN:
621 if (ifr->ifr_qlen < 0)
622 return -EINVAL;
623 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
624
625 case SIOCSIFNAME:
626 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
627 return dev_change_name(dev, ifr->ifr_newname);
628
629 case SIOCWANDEV:
630 return dev_siocwandev(dev, &ifr->ifr_settings);
631
632 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
633 return dev_siocdevprivate(dev, ifr, data, cmd);
634
635 case SIOCSHWTSTAMP:
636 return dev_set_hwtstamp(dev, ifr);
637
638 case SIOCGHWTSTAMP:
639 return dev_get_hwtstamp(dev, ifr);
640
641 case SIOCGMIIPHY:
642 case SIOCGMIIREG:
643 case SIOCSMIIREG:
644 return dev_eth_ioctl(dev, ifr, cmd);
645
646 case SIOCBONDENSLAVE:
647 case SIOCBONDRELEASE:
648 case SIOCBONDSETHWADDR:
649 case SIOCBONDSLAVEINFOQUERY:
650 case SIOCBONDINFOQUERY:
651 case SIOCBONDCHANGEACTIVE:
652 return dev_siocbond(dev, ifr, cmd);
653
654 /* Unknown ioctl */
655 default:
656 err = -EINVAL;
657 }
658 return err;
659 }
660
661 /**
662 * dev_load - load a network module
663 * @net: the applicable net namespace
664 * @name: name of interface
665 *
666 * If a network interface is not present and the process has suitable
667 * privileges this function loads the module. If module loading is not
668 * available in this kernel then it becomes a nop.
669 */
670
dev_load(struct net * net,const char * name)671 void dev_load(struct net *net, const char *name)
672 {
673 struct net_device *dev;
674 int no_module;
675
676 rcu_read_lock();
677 dev = dev_get_by_name_rcu(net, name);
678 rcu_read_unlock();
679
680 no_module = !dev;
681 if (no_module && capable(CAP_NET_ADMIN))
682 no_module = request_module("netdev-%s", name);
683 if (no_module && capable(CAP_SYS_MODULE))
684 request_module("%s", name);
685 }
686 EXPORT_SYMBOL(dev_load);
687
688 /*
689 * This function handles all "interface"-type I/O control requests. The actual
690 * 'doing' part of this is dev_ifsioc above.
691 */
692
693 /**
694 * dev_ioctl - network device ioctl
695 * @net: the applicable net namespace
696 * @cmd: command to issue
697 * @ifr: pointer to a struct ifreq in user space
698 * @data: data exchanged with userspace
699 * @need_copyout: whether or not copy_to_user() should be called
700 *
701 * Issue ioctl functions to devices. This is normally called by the
702 * user space syscall interfaces but can sometimes be useful for
703 * other purposes. The return value is the return from the syscall if
704 * positive or a negative errno code on error.
705 */
706
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)707 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
708 void __user *data, bool *need_copyout)
709 {
710 int ret;
711 char *colon;
712
713 if (need_copyout)
714 *need_copyout = true;
715 if (cmd == SIOCGIFNAME)
716 return dev_ifname(net, ifr);
717
718 ifr->ifr_name[IFNAMSIZ-1] = 0;
719
720 colon = strchr(ifr->ifr_name, ':');
721 if (colon)
722 *colon = 0;
723
724 /*
725 * See which interface the caller is talking about.
726 */
727
728 switch (cmd) {
729 case SIOCGIFHWADDR:
730 dev_load(net, ifr->ifr_name);
731 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,
732 ifr->ifr_name);
733 if (colon)
734 *colon = ':';
735 return ret;
736 /*
737 * These ioctl calls:
738 * - can be done by all.
739 * - atomic and do not require locking.
740 * - return a value
741 */
742 case SIOCGIFFLAGS:
743 case SIOCGIFMETRIC:
744 case SIOCGIFMTU:
745 case SIOCGIFSLAVE:
746 case SIOCGIFMAP:
747 case SIOCGIFINDEX:
748 case SIOCGIFTXQLEN:
749 dev_load(net, ifr->ifr_name);
750 rcu_read_lock();
751 ret = dev_ifsioc_locked(net, ifr, cmd);
752 rcu_read_unlock();
753 if (colon)
754 *colon = ':';
755 return ret;
756
757 case SIOCETHTOOL:
758 dev_load(net, ifr->ifr_name);
759 ret = dev_ethtool(net, ifr, data);
760 if (colon)
761 *colon = ':';
762 return ret;
763
764 /*
765 * These ioctl calls:
766 * - require superuser power.
767 * - require strict serialization.
768 * - return a value
769 */
770 case SIOCGMIIPHY:
771 case SIOCGMIIREG:
772 case SIOCSIFNAME:
773 dev_load(net, ifr->ifr_name);
774 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
775 return -EPERM;
776
777 rtnl_net_lock(net);
778 ret = dev_ifsioc(net, ifr, data, cmd);
779 rtnl_net_unlock(net);
780
781 if (colon)
782 *colon = ':';
783 return ret;
784
785 /*
786 * These ioctl calls:
787 * - require superuser power.
788 * - require strict serialization.
789 * - do not return a value
790 */
791 case SIOCSIFMAP:
792 case SIOCSIFTXQLEN:
793 if (!capable(CAP_NET_ADMIN))
794 return -EPERM;
795 fallthrough;
796 /*
797 * These ioctl calls:
798 * - require local superuser power.
799 * - require strict serialization.
800 * - do not return a value
801 */
802 case SIOCSIFFLAGS:
803 case SIOCSIFMETRIC:
804 case SIOCSIFMTU:
805 case SIOCSIFHWADDR:
806 case SIOCSIFSLAVE:
807 case SIOCADDMULTI:
808 case SIOCDELMULTI:
809 case SIOCSIFHWBROADCAST:
810 case SIOCSMIIREG:
811 case SIOCBONDENSLAVE:
812 case SIOCBONDRELEASE:
813 case SIOCBONDSETHWADDR:
814 case SIOCBONDCHANGEACTIVE:
815 case SIOCSHWTSTAMP:
816 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
817 return -EPERM;
818 fallthrough;
819 case SIOCBONDSLAVEINFOQUERY:
820 case SIOCBONDINFOQUERY:
821 dev_load(net, ifr->ifr_name);
822
823 rtnl_net_lock(net);
824 ret = dev_ifsioc(net, ifr, data, cmd);
825 rtnl_net_unlock(net);
826
827 if (need_copyout)
828 *need_copyout = false;
829 return ret;
830
831 case SIOCGIFMEM:
832 /* Get the per device memory space. We can add this but
833 * currently do not support it */
834 case SIOCSIFMEM:
835 /* Set the per device memory buffer space.
836 * Not applicable in our case */
837 case SIOCSIFLINK:
838 return -ENOTTY;
839
840 /*
841 * Unknown or private ioctl.
842 */
843 default:
844 if (cmd == SIOCWANDEV ||
845 cmd == SIOCGHWTSTAMP ||
846 (cmd >= SIOCDEVPRIVATE &&
847 cmd <= SIOCDEVPRIVATE + 15)) {
848 dev_load(net, ifr->ifr_name);
849
850 rtnl_net_lock(net);
851 ret = dev_ifsioc(net, ifr, data, cmd);
852 rtnl_net_unlock(net);
853 return ret;
854 }
855 return -ENOTTY;
856 }
857 }
858